Minggu, 25 September 2011

Method of combination reverse osmosis and ion exchange

Osmosis is the process of transfer of water from the solution whose concentrationlow to high solution concentration due to the pressureosmosis. This change is through a semipermeable membrane, where the processtransfer of water will stop after the concentration of the two solutions together. ROrequires a hydrostatic pressure greater than the pressure differenceosmotiknya so that water can flow from the solution of higher concentrationthrough a semipermeable membrane.RO systems are generally composed of four processes, namely:1. Early treatment (pretreatment) Feedwater first processed to fit the conditions of the membrane withremove suspended solids, adjust pH and add operationsinhibitor to control scaling caused by constituents such ascalcium sulfate.2. Giving pressure Feed water that has been processed is increased pressure to pump updesired operating pressure to conform with the membrane and salinityfeed water.3. membrane separation Semipermeable membrane which inhibits the course of feed water through it.The water output from the membrane form of water called permeate, andretained on the membrane is called concentrate. However, since nomembranes that can work 100% perfect, then there is a small portion of saltwhich still can pass through the membrane.